Title: Configure Your Datasource to Use JTA Transactions

I think that there is a little mishmash in transaction naming generally in the whole guide. I was filling some doc bug in past about this and I think that it could be fine to fix it as well here.

The title says "Use JTA Transactions" but in the guide we differ JTA and JTS transaction. This chapter talks about enable (any) transactions for the datasource. The title should better be like: "Configure Your Datasource to Use Transactions" or "Configure Your Datasource to Use Java Transaction API"

This change should be reflected to the whole chapter. The "Summary" is ok as it says "This task shows you how to enable Java Transactions API". But then all the following points talks about JTA Transactions. It should be better just transaction or Java Transaction API or just JTA.

Plus, please change the summary from:
This task shows you how to enable Java Transactions API
to
This task shows you how to enable Java Transaction API